Fix `/messages` throwing a 500 when querying for non-existent room (#12683)

Fix https://github.com/matrix-org/synapse/issues/12678

Complement test added:  https://github.com/matrix-org/complement/pull/369

**Before:** 500 internal server error

**After:** According to the [spec](https://spec.matrix.org/latest/client-server-api/#get_matrixclientv3roomsroomidmessages), calling `/messages` against a non-existent `room_id` should throw a 403 forbidden (since you're not part of the room). This also matches the behavior before https://github.com/matrix-org/synapse/pull/12370 which regressed Synapse to the 500 behavior.
```json
{
    "errcode": "M_FORBIDDEN",
    "error": "User @test:my.synapse.server not in room !dne:my.synapse.server, and room previews are disabled"
}
```

2 files changed, 12 insertions, 16 deletions

diff --git a/synapse/handlers/pagination.py b/synapse/handlers/pagination.py
index 7ee3340373..2e30180094 100644
--- a/synapse/handlers/pagination.py
+++ b/synapse/handlers/pagination.py
@@ -448,7 +448,7 @@ class PaginationHandler:
             )
             # We expect `/messages` to use historic pagination tokens by default but
             # `/messages` should still works with live tokens when manually provided.
-            assert from_token.room_key.topological
+            assert from_token.room_key.topological is not None
 
         if pagin_config.limit is None:
             # This shouldn't happen as we've set a default limit before this
diff --git a/synapse/storage/databases/main/stream.py b/synapse/storage/databases/main/stream.py
index 793e906630..4e1d9647b7 100644
--- a/synapse/storage/databases/main/stream.py
+++ b/synapse/storage/databases/main/stream.py
@@ -785,22 +785,14 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
         return None
 
     async def get_current_room_stream_token_for_room_id(
-        self, room_id: Optional[str] = None
+        self, room_id: str
     ) -> RoomStreamToken:
-        """Returns the current position of the rooms stream.
-
-        By default, it returns a live token with the current global stream
-        token. Specifying a `room_id` causes it to return a historic token with
-        the room specific topological token.
-        """
+        """Returns the current position of the rooms stream (historic token)."""
         stream_ordering = self.get_room_max_stream_ordering()
-        if room_id is None:
-            return RoomStreamToken(None, stream_ordering)
-        else:
-            topo = await self.db_pool.runInteraction(
-                "_get_max_topological_txn", self._get_max_topological_txn, room_id
-            )
-            return RoomStreamToken(topo, stream_ordering)
+        topo = await self.db_pool.runInteraction(
+            "_get_max_topological_txn", self._get_max_topological_txn, room_id
+        )
+        return RoomStreamToken(topo, stream_ordering)
 
     def get_stream_id_for_event_txn(
         self,
@@ -870,7 +862,11 @@ class StreamWorkerStore(EventsWorkerStore, SQLBaseStore):
         )
 
         rows = txn.fetchall()
-        return rows[0][0] if rows else 0
+        # An aggregate function like MAX() will always return one row per group
+        # so we can safely rely on the lookup here. For example, when a we
+        # lookup a `room_id` which does not exist, `rows` will look like
+        # `[(None,)]`
+        return rows[0][0] if rows[0][0] is not None else 0
 
     @staticmethod
     def _set_before_and_after(